APPARATUS FOR SUPPRESSION OF SPURIOUS ATTENUATION POLES IN CRYSTAL FILTERS - Patent 0156808

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EP 0 156 808 A1

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(43)	Date of publication:
	09.10.1985 Bulletin 1985/41

(21)	Application number: 84901862.0

(22)	Date of filing: 12.04.1984

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International Patent Classification (IPC):

H03H 9/ 05^{( . )}

H03H 9/ 56^{( . )}

(86)	International application number:
	PCT/US1984/000565

(87)	International publication number:
	WO 1984/004434 (08.11.1984 Gazette 1984/26)

(84)	Designated Contracting States:
	AT CH DE FR GB LI LU NL SE

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Priority:

27.04.1983 US 19830488874

(71)	Applicant: MOTOROLA, INC.
	Schaumburg, IL 60196 (US)

(72)	Inventor:
	HIGGINS, Robert, J., Jr. Sunrise, FL 33322 (US)

(74)	Representative: Hudson, Peter David
	Motorola, European Intellectual Property Operations, Midpoint Alencon Link Basingstoke, Hampshire RG21 7PL Basingstoke, Hampshire RG21 7PL (GB)

(54)	APPARATUS FOR SUPPRESSION OF SPURIOUS ATTENUATION POLES IN CRYSTAL FILTERS